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Negative electrode material, negative electrode plate, preparation method of negative electrode plate and all-solid-state lithium ion battery

A technology for lithium-ion batteries and negative electrode materials, applied in the direction of negative electrodes, battery electrodes, secondary batteries, etc., can solve the problems of low working voltage, need for improvement, low initial Coulombic efficiency, etc.

Active Publication Date: 2020-07-17
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the development of technology, the demand for high-energy-density lithium batteries is becoming more and more urgent. Silicon-containing particles are one of the most promising anode materials for lithium-ion batteries. Its working voltage is low and its theoretical specific capacity is about 2400mAh / g, but its first Coulombic efficiency (ICE) is low, which limits its practical application to some extent
[0003] Therefore, the related technologies of lithium-ion batteries still need to be improved.

Method used

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  • Negative electrode material, negative electrode plate, preparation method of negative electrode plate and all-solid-state lithium ion battery
  • Negative electrode material, negative electrode plate, preparation method of negative electrode plate and all-solid-state lithium ion battery
  • Negative electrode material, negative electrode plate, preparation method of negative electrode plate and all-solid-state lithium ion battery

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Embodiment 1

[0050] Under the protection of an argon atmosphere, silicon carbon powder (the outer surface of silicon oxide particles is coated with a carbon layer, and the D50 particle size is 4 microns) and coated lithium powder (the outer surface of lithium powder is coated with fluorine) with a purity of more than 99% Lithium oxide, D50 particle size is 8 microns), solid electrolyte Li 6 P.S. 5 Cl (D50 particle size is 6 microns) and conductive agent (1-2 micron conductive carbon) are weighed according to the mass ratio of 6:1:2.5:0.5, placed in the mortar and ground and mixed evenly (scanning electron microscope of the product obtained after grinding see photos figure 1 ), then put it into the self-made mold battery, press the tablet under 10MPa pressure, and then weigh 120mg Li 6 P.S. 5 Cl electrolyte powder, put it into a self-made mold sleeve, continue to compact with a pressure of 10MPa, and then add NCM622 positive electrode and Li 6 P.S. 5 The Cl electrolyte mixed powder was...

Embodiment 2

[0054] With embodiment 1, the difference is that silicon carbon powder, coated lithium powder, solid electrolyte Li 6 P.S. 5 Cl and conductive agent are mixed according to the mass ratio of 7:0.5:2:0.5.

Embodiment 3

[0056] With embodiment 1, the difference is that silicon carbon powder, coated lithium powder, solid electrolyte Li 6 P.S. 5 Cl and conductive agent are mixed according to the mass ratio of 4:2:3.5:0.5.

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Abstract

The invention provides a negative electrode material, a negative electrode plate, a preparation method of the negative electrode plate and an all-solid-state lithium ion battery. The negative electrode material comprises coated lithium powder; silicon carbon powder; a conductive agent; and a solid electrolyte, wherein the coated lithium powder comprises lithium powder and a lithium-conducting coating layer coating at least one part of the outer surface of the lithium powder. In the negative electrode material, on one hand, the coated lithium powder is adopted, so that the activity of the coated lithium powder is greatly reduced compared with that of the lithium powder while the lithium can be effectively supplemented, no strict requirements for environment and equipment exist, the compatibility compared with the prior art is high, the production cost is lower, and meanwhile, the operation safety is greatly improved; and on the other hand, the solid electrolyte is added into the negative electrode material, so that the side reaction of the lithium powder and the solid electrolyte can be greatly reduced, the first coulombic efficiency can be effectively improved, and meanwhile, a lithium battery system has higher safety.

Description

technical field [0001] The invention relates to the field of all-solid lithium-ion batteries, and in particular, relates to a negative electrode material, a negative electrode sheet, a preparation method thereof, and an all-solid-state lithium-ion battery. Background technique [0002] With the development of technology, the demand for high-energy-density lithium batteries is becoming more and more urgent. Silicon-containing particles are one of the most promising anode materials for lithium-ion batteries. Its working voltage is low and its theoretical specific capacity is about 2400mAh / g, but its first Coulombic efficiency (ICE) is low, which limits its practical application to some extent. [0003] Therefore, the current related technologies of lithium-ion batteries still need to be improved. Contents of the invention [0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. Therefore, an object of the ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/62H01M4/13H01M10/0525
CPCH01M4/366H01M4/382H01M4/483H01M4/628H01M4/625H01M4/13H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 黄海强陈少杰周龙捷邓素祥马忠龙
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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